[ew] Add basic classes.

webkit/browser/fileapi/plugin_private_file_system_backend.cc

Index: webkit/browser/fileapi/plugin_private_file_system_backend.cc
diff --git a/webkit/browser/fileapi/plugin_private_file_system_backend.cc b/webkit/browser/fileapi/plugin_private_file_system_backend.cc
index 2c8ed3bac8fe8b7c97f5e7f3c60d685c087dff56..98dfc750597938345c32b4f8615728a04ee01053 100644
--- a/webkit/browser/fileapi/plugin_private_file_system_backend.cc
+++ b/webkit/browser/fileapi/plugin_private_file_system_backend.cc
@@ -160,6 +160,11 @@ PluginPrivateFileSystemBackend::GetAsyncFileUtil(FileSystemType type) {
   return file_util_.get();
 }
 
+WatcherManager* PluginPrivateFileSystemBackend::GetWatcherManager(
+    FileSystemType type) {
+  return NULL;
+}
+
 CopyOrMoveFileValidatorFactory*
 PluginPrivateFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     FileSystemType type,